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NEW QUESTION: 1
What kind of encryption technology does SSL utilize?
A. Public Key
B. Secret or Symmetric key
C. Hybrid (both Symmetric and Asymmetric)
D. Private Key
Answer: C
Explanation:
Explanation/Reference:
Explanation:
SSL uses asymmetric encryption to securely share a key. That key is then used for symmetric encryption to encrypt the data.
IPsec and SSL use asymmetric encryption to establish the encryption protocol when the session starts and then to securely exchange a private key used during the session. This private key is similar to the single secret key used in symmetric encryption.
Asymmetric encryption uses a key pair -- both a public and a private one -- for encryption. The sender uses the receiver's public key to encrypt the data and the receiver uses their private key to decrypt it. The transmission is secure because the recipient always has the private key in their possession and never exposes it by sending it over a public connection, such as the Internet.
There is a catch to using asymmetric encryption. It runs about 1,000 times slower than symmetric encryption and eats up just as much processing power, straining already overburdened servers. That means asymmetric encryption is only used (by IPsec and SSL) to create an initial and secure encrypted connection to exchange a private key. Then, that key is used to create a shared secret, or session key, that is only good during the session when the two hosts are connected.
Incorrect Answers:
A: SSL uses both symmetric and asymmetric encryption, not just symmetric encryption.
C: SSL does not use only public key encryption; shared key (symmetric) encryption is also used.
D: SSL does not use private key encryption. Initially, encryption is performed using public keys and decryption is performed using private keys (asymmetric). Then both encryption and decryption are performed using a shared key (symmetric).
References:
http://searchsecurity.techtarget.com/answer/How-IPsec-and-SSL-TLS-use-symmetric-and-asymmetric- encryption
NEW QUESTION: 2
In network design, a redundant network topology can be used to provide higher reliability for customer services.
Which of the following topologies can be used to provide redundancy? (Multiple Choice)
A. Dual-star topology
B. Star topology
C. Ring topology
D. Bus topology
Answer: A,C
NEW QUESTION: 3
When you migrate a network from PVST+ to rapid-PVST+, which two features become inactive? (Choose two.)
A. Bridge Assurance
B. Loop guard
C. BackboneFast
D. Root guard
E. UDLD
F. UplinkFast
Answer: C,F
Explanation:
It is good to know the UplinkFast and BackboneFast behavior before you start the
migration process.
Here, the Access1 switch runs Cisco IOS. This output is taken before migration to the
rapid-PVST+ mode:
Access1#show spanning-tree vlan 10
VLAN0010
Spanning tree enabled protocol ieee
Root ID Priority 24586
Address 0015.63f6.b700
Cost 3019
Port 107 (FastEthernet3/0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 49162 (priority 49152 sys-id-ext 10)
Address 000f.f794.3d00 Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec Aging Time 300 Uplinkfast enabled
Interface Role Sts Cost Prio.Nbr Type
Fa3/0/1 Root FWD 3019 128.107 P2p Fa3/0/2 Altn BLK 3019 128.108 P2p
Access1#show spanning-tree summary Switch is in pvst mode Root bridge for: none Extended system ID is enabled Portfast Default is disabled PortFast BPDU Guard Default is enabled Portfast BPDU Filter Default is disabled Loopguard Default is disabled EtherChannel misconfig guard is enabled UplinkFast is enabled BackboneFast is enabled Configured Pathcost method used is short
Name Blocking Listening Learning Forwarding STP Active
VLAN0010 1 0 0 1 2 VLAN0020 1 0 0 1 2
2 vlans 2 0 0 2 4
This output is taken after the mode is changed to rapid-PVST+:
Access1#show spanning-tree vlan 10
VLAN0010
Spanning tree enabled protocol rstp
Root ID Priority 24586
Address 0015.63f6.b700
Cost 3019
Port 107 (FastEthernet3/0/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 49162 (priority 49152 sys-id-ext 10)
Address 000f.f794.3d00
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
UplinkFast enabled but inactive in rapid-pvst mode
Interface Role Sts Cost Prio.Nbr Type
Fa3/0/1 Root FWD 3019 128.107 P2p Fa3/0/2 Altn BLK 3019 128.108 P2p
Access1#show spanning-tree summary Switch is in rapid-pvst mode Root bridge for: none Extended system ID is enabled Portfast Default is disabled PortFast BPDU Guard Default is enabled Portfast BPDU Filter Default is disabled Loopguard Default is disabled EtherChannel misconfig guard is enabled
UplinkFast is enabled but inactive in rapid-pvst mode BackboneFast is enabled but inactive in rapid-pvst mode
Configured Pathcost method used is short
Name Blocking Listening Learning Forwarding STP Active
VLAN0010 1 0 0 1 2 VLAN0020 1 0 0 1 2
2 vlans 2 0 0 2 4
You can see in the show spanning-tree summary command output that UplinkFast and BackboneFast are enabled, but are inactive in rapid-PVST mode.
Reference: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-seriesswitches/72836-rapidpvst-mig-config.html#upback1